In majority-Kurdish areas, this model appears sustainable for the time being. Complaints are common, especially concerning mandatory conscription, the Self-Administration’s chaotic handling of the school system, infrequent electricity and arbitrary arrests of the PYD’s Kurdish political opponents. Another huge problem is the economy, which is deeply constricted by Turkey’s closure of its border with YPG-held areas. On the Iraqi border, the Kurdistan Regional Government (KRG, controlled by the rival Kurdistan Democratic Party, KDP, a close ally of Turkey), limits trade to a small and unreliable trickle. That said, judging by the dismal standards of wartime Syria, the net governance result nevertheless appears positive: YPG-held areas are far safer and better administered than those controlled by opposition factions, and the security services are much less brutal than those of the regime and ISIS. Moreover, there is palpable Kurdish pride, even among some critics, in the YPG’s military accomplishments and in the extent to which those have transformed Kurdish language and culture from suppressed to locally dominant.
Muir, Marcus Dods and others have suggested that Muhammad was at first sincere, but later became deceptive. Koelle finds "the key to the first period of Muhammad's life in Khadija , his first wife," after whose death he became prey to his "evil passions."  Samuel Marinus Zwemer , a Christian missionary , criticised the life of Muhammad by the standards of the Old and New Testaments , by the pagan morality of his Arab compatriots, and last, by the new law which he brought.  Quoting Johnstone, Zwemer concludes by claiming that his harsh judgment rests on evidence which "comes all from the lips and the pens of his [. Muhammad's] own devoted adherents."